Centrifugal pump or blower.



J. STOETZEL.

GENTRIFUGAL PUMP 'on BLOWER.

APPLIOATION FILED JUNE 5, 19 11.

Patented Sept. 19,1911.

2 SHEETS-SHEET 1.

' JPJ. S TOETZEL. GENTRIFUGAL PUMP 0R BLOWER.

APPLICATION FILED JUNE 5, 1911.. 4

Patented Sept. 19, 1911.

2 SHEETS-SHEET 2.

OFFTCE.

J'QIISEPH J. STOE'IZEL, Oi CHICAGO, ILLINQKS.

CENTRIFUGAL PUMP OR- 3140 37131? $pecificationof Letters l atent.Patented Sephilg, 1911.

fipplieation filed June 5, 1:311. Serial no. caress.

1'0 all whom it may concern:

Be it known that 1 JOSEPH J. SToE'rzEL, a citizen of the United Statesof America and a resident of Ehicago, county of Cook, State of Illinois,have invented certain new. and

,useful Improvements in Centrifugal Pumps or Blowers, of which'thefollowingis a specification.

The main objects of this invention are to provide an improved form ofcentrifugal pump or blower having an improved construction andarrangement of its vanes, whereby the fluids operated upon'will begradually set in motion so as to reduce losses due to impact'of thevanes upon the fluid, whereby the losses due to eddy currents will bereduced, and wherebythe inlet passages may be substantially(to-extensive with the radial extent ofthe vanes, thereby insuring thatthe fluid will completely fill the spaces between the vanes and alsoinsuring a -uniformly distributed discharge throughout the entireperipheral area of the rotary member.

An illustrative embodiment of this invention is shown in theaccompanying drawing,

taken on line AA of Fig. 1. Fig. 3 is afragmentary detail ofthc rotarymember taken on line B-B of Fig. 1 and illustrating. the relativearrangement of the vanes on the rotary member.

In the construction shown in the draw,

ings, the housing or casing 1 is supported on the base 2 and has axialair inlet openings 3 on oppositesides thereof and a tangential airoutlet opening 4. The casing 1 may be of any suitable form, and is shownin the drawings as being of the usual volute shape.

The fan or rotary member comprisesa pair of corneal plates or endmembers 6 and 7 arranged with theirconcave faces op posed and spacedapart axially to form a contracted peripheral opening between theirouter edges. These plates are of less diameter than the interior of thecasing, affording the usual space 5 between the periphery of the platesand the casing 1. Each of these plates has a centrally disposed airinlet opening 8 located in axial alineme nt with the inlet openings 3 ofthe casing 1. A disk 9 ofle'ss diameter than the plates -6 and 7 andslightly tapered toward its periphery is centrally arranged between theplates 6 and 7 and rotatable therewith- Two sets of vanes 10 arerespectively secured to the opposite sides of the. disk 9 and extendradially outward to the peripheral opening between the outer edges ofthe plates 6 and 7 their outer ends being substantially in the sameplane of revolution. The vanes 10 are of channel shaped cross-sectionand have side flanges 11 facing in the direction of rotation. Twoadditional sets of vanes 12 are secured to the inner surfaces of theconical plates 6 and 7 and extend outwardly to the peripheries of saidplates. These vanes may be of angle-shaped cross section and aredisposed. with one leg or flange 13 spaced away from its respective endplate and facing in the direct-ion of rotation. Thus the vanes 12,together with the respective end plates, are in eflect also of channelcross section. i r

In the form shown, there are thus four sets'of vanes and these arearranged in groups of four, one from each set, the inner ends of thosein each group being in axial alinenient. The outer ends of all of thevanes are arranged one in front of the other in circumferentialalinement. The vanes 12 terminate atthe edge ofthe openings 8, the vanes10 extend a little nearer to theax s. In the form shown, the vanes .10and 12 are each of substantially uniform width throughout their length,-the width being equal to the distance between the end members 6 andzit-their peripheries. The inner ends of the dilferent sets of vanes arespaced apart axially toprovide the annular spaces 14 at opposite sidesof the disk 9' between the adjacent edges of the vanes, these spacescommunicating. with the air inlet openings 3 and 8- and convergingupwardly to the point 15 where the paths of rotation of the vanes ofdifferent sets become coineident. The disk 9 also serves to separatetheair currents which-enter from opposite sides of the casing.

The plates 6 and 7 and disk 9 are fixed on the shaft 16 journaled inbearing 17 at opposite sides of the casing 1. A pulley 18 is secured tothe outer end of the shaft 16 by means of which the rotary member isdriven. In the form shown, the plates .6 and 7, in addition to carryingthe vanes 12, aresecured at their outer edges to the vanes and theiredges are braced by arms l9.

The operation of the device shown is as follows :-,As the vanes rotate,the air in the spaces between them is rotated and caused to flowcentrifugally outward along the vanes 10 and 12. In devices of-thisnature, the air in the paths of the vanes increases in density as itapproaches the periphery ofthe wheel by reason of its inertia tendencyto form a partial vacuum in the spaces immediately behind the vanes. Ifthese spaces are not kept filled with air, the air will leave the vanesand in the form of a succession of jets which expand in the space withinthe casing and there is thus a' decided loss in efficiency. In priorblowers, it has been foundnecessary to make the vanes comparativelyshort radially to reduce this tendency. In the present invention, byvirtue of the spaces 14, air is supplied to the vanes not only at theirinnerends, but also all along their edges. The vanes being ofchannel-cross 'section,'their flanges preventthe air in front of themfrom escaping at the side, but allow new air from the spaces 14 ency ofthe air to be drawn in from the to flow freely intO-the ath of the vanesto 30- ofi-s et the tendency "to the. formation of partial vacuumsimmediately behind the vanes. i

It will thus be seen that the spaces within the paths of the vanes 10and' 12 are kept full. of air practically all of the time, and that forthis reason, the air is discharged at the periphery of-the wheel, not.in the, form of a series of jets but in the form of'a' continuousunbroken stream extending over the entire area of the periphery of thewheel.

There istherefore no back-lash or tendspace 5 back into the vanes attheir ends as is the case in structures where the vanes are not fullysupplied with air. Thus,1with this device it is possible to keep the airin I the casing at a uniform pressure and as it is discharged from theoutlet 4, thearea of the discharging air current is substan-" tiallyequal to the e'fi'eetive area of the opening.

this inventionis herein shown and described, it will be understood thatnumerous. details .of the. construction shown may be altered or omittedwithout. departing from the spirit of thisfinvention, following claims.

as definedby the I claim-: i

1. In afdevi'ce'of the vanes adapted to teceive'fluid at. their innerends and discharge it] at their outer ends, a 4 second set of vanes alsoadap'tedto receive "@fiuid at their inner end sand discharge it at andthe impact of the vanes and there is a.

class described, thetheir outer ends and having their inner ends .saidfirst set of vanes, both of said sets of -vanes having their outer. endslocated in substantially the same plane of revolution.

2. In a device of the class described, the combination of two sets ofradially disposed vanes each adapted to receive fluid at its inner endand discharge it centrifugally at its outer end, the'inner ends of thevanes in one set beiiig spaced axially from those in.the;other"set andthe outer ends of said vanes being located substantially in the sameplane of revolution.

3. In a device of the class described, the combination of a plurality ofsets of radially disposed vanes, each set being adapted to receive fluidat. its inner end and discharge it at its outer end, the inner ends ofthe vanes in each set being spaced axially away from. the inner ends ofthe vanes in the other sets, and allof said vanes being disposed so thattheir outer ends are substantially in the same plane of revolution."

' 4. In a device of the class described, the combination of aseries ofradially disposed vanes adapted to receive fluid at their inner ends'anddischarge it at their outer ends, said vanes havin etheir outer-endsarranged substantially in t e'same plane of IBXOllltlOll and having?their innersends arranged in staggered relationfwith respect to suchplane of revollltlbl}; v

5, In a device;- ofjthe' class described, the vcombinetion of two setsof radially disposed vanes each adagted'to receive fluid at its innerend and ischarge it centrifugally at one set being spaced axially fromthose in the other set and the outer ends of said .vanes beinglocatedsubstantially in the same plane of revolution, the axial spacing of theinner ends of the vanes being such as paths of rotation of the vanes.

6. In adeviceof the-class described, the combination of two sets ofradially disposed vanes each adapted'to receive fluid at its inner end'and discharge it centrifugally at its outer end, the inner ends of thevanes in one set being spaced axially from those in Although but onespecific embodiment of the other set and the outer ends of ,said

same plane of revolution, the axial spacing of the inner ends of thevanes and the shape of the vanes being such that. the paths "of rotationof said vanes are distinct and spaced apart adjacent to theaxis, butconverge'towardeach other at'their outer ends.

7. In a device of the class described, the combination of two sets ofradially disposed vanes each adapted to receive fluid at its inner endand discharge it centrifugally at its outer end, the, 'inner ends of thevenesin one set being spaced axially from its outer end,'-the inner endsof the vanes in vanes being located substantially in the spaced axiallyaway from'the inner-ends of to provide an annular air space'between thethose in the other set, and the outer ends of said vanes being locatedsubstantially in the same plane of revolution, and a disk interposedbetween the inner ends of the vanes of different sets so as to causeeach to draw fluid from its respective side of the device.

8. In a device of the class described, the combination of two sets ofradially disposed vanes each adapted to receive fluid at its inner endand discharge it centrifugally at its outer end, the inner ends of thevanes in one set being spaced axially from those in the other set andthe outer ends of said vanes being located substantially in the sameplane of revolution, each of said vanes being substantiallychannel-shaped in transverse section with its open side facing in thenormal direction ofrotation of the vanes. 9. In a device of the classdescribed, the combination of two sets of radially disposed vanes eachadapted to receive fluid at its inner end and discharge it centrifugallyat its outer end, the inner ends of the vanes in one set being spacedaxially frointhose in the other set and the outer ends "of said vanesbeing located substantially in the same plane of revolution, and a airof end plates secured against opposite sides of said vanes, being openat their middle part and spaced apart at theirouter edges.

10. In a device of the class described, the combination of two sets ofradially disposed vanes each adapted to receive fluid at its inner endand discharge it centrifugally at its outer end, the inner ends of thevanes in one set being spaced axially from those in the other set andthe outer ends of said vanes being located substantially in the sameplane of revolution, a pair of end plates secured against opposite sidesof said vanes, being open at their middle part and spaced apart'at theirouter edges, and a casing surrounding said vanes and end plates, beingin open communication with the space between said plates atthe edgesthereof and having an outlet opening.

11. In a device of the class described, the

combination of two sets of radially disposed vanes each adapted toreceive fluid at its inner end and discharge it centrifugally at itsouter end, the inner ends of the vanes in one set being spaced axiallyfrom those in the other set, and the outer endsof said vanes beinglocated substantially in the same plane of revolution, each vane in eachset being of substantially uniform transverse sectional t'orm throughoutits length.

12. A device of the class described, comprising a supporting frame} a.shaft journaled therein, a hub member rigidly mounted on said shaft,,two sets of radially disposed vanes secured to'respectively oppositefaces" of said hub member, being spaced apart at their innerends andin-- clined toward each other at their outer ends,

a pair of end plates spaced apart at their middle part and inclinedtoward each other cent edges of said vanes, communicatingdirectly withsaid air inlet.

14. In a centrifugal blower, the combination of a casing having airinlet and outlet openings, a fan member rotat-ably mounted in saidcasing and having vanes thereon, the inner ends of said vanes beingspaced apart axially and the outer ends being spaced peripherally in thesame plane of rotation, so as to provide an annular air space betweenthe paths of adjacent edges of said vanes.

.15. In a centrifugal blower, the combination ofa casing having airinlet and outlet openings, a ,pair of members rotatably mounted in saidcasing, said members being s spaced apart axially and relativelyinclined toward each other, a plurality of radially disposed vanescarried on the opposed surfaces of said members, the width of the innerends of said vanes beingless than half the distance between the'adjacentparts of said members so as to provide an annular .air space between theadjacent edges of said I .vanes.

"16. In a centrifugal blower, the combination of a casing having airinlet and outlet openings, a pair of conical end members bers beingspaced apart axially with their concave surfaces opposed, a plurality ofradially disposed vanes carried on the concave surfaces of said members,said vanes having a uniform width substantially equal rotatably mountedin said casing, said memto the distance between said members at theirperipheries, and the concavity of said members being such as to providean annular air space between the-adjacent edges of said vanes andcommunicating with said air inlet.

, 17. In a centrifugal blower, the con1bination of a casing having axialinlet and peripheral outletopenings, a pair of conical end membersrotatably mounted in said cas ing and provided with axial air inletopenings, said end members being spaced apart axially with their concavesurfaces opposed, a .disk of less diameter than said members arrangedcentrally between said members and rotatable'therewith, a pluralityofvanes carried on the opposed surfaces of said members and disk, saidvanes being of a substantially uniform width substantially equal to thedistance between said members at their peripheries whereby they arespaced apart axially at their inner ends so as to provide annular airspaces'between the adjacent edges of said vanes and disk andcommunicating with said air inlet openings.

18. In a centrifugal blower, the combination of a casing having airinlet and outlet openings, a pair of conical members rotatablymounted-in said casing, said members being spaced apart axially withtheir conical surfaces opposed, a disk of less diameter than saidmembers arranged between them and rotatable therewith, a plurality ofvanes car; ried on the opposed surfaces of said members and disk, thevanes carried by said disk being of. channel cross section with sideflanges disposed in the direction of rotation. and the vanes on saidmembers being of angle cross section with the flange spaced awayfromsaid members and disposed in the-direction of rotation, said vanesbeing substantially equal in width to the space between said 'meinbersat their peripheries and being shaped soas to be spaced apart at theirinner ends so as to provide annular air spaces between the adjacentedges of the adjacent sets of vanes.

'19. In a centrifugal blower, the combination of a casing having airinlet and outlet openings, a pair of members rotatably mounted in saidcasing and spaced apart axially, a plurality of vanes carried byone ofsaid members, said vanes extending across the space bet-ween saidmembers at their peripheries and being spaced away from the other memberat their inner ends so as to provide an annular air space between saidvanes and said other member.

20. In a centrifugal blower, the combination of a. casing having airinlet and outlet openings, av palr of members rotatably mounted in saidcasing and spaced apart aXially,- a plurality of vanes extending acrossthe space between said members at their peripheries and being spacedaway from the other member at their inner ends so, as to provide anannular air space be tween said vanes and said other member, and each ofsaid vanes having a forwardly extending flange on the edge opposed tosaid other member. I s

21.- A device of the class described, comprising a pair of end platesrot-atably mounted, being spaced apart and open at their middle part andconverging toward each other at their peripheries, two sets of radiallydisposed vanes respectively secured against said plates, said vanesbeing each of a width at their outer ends corresponding substantially tothe space between the peripheries of said plates, and being of a widthat their inner 'ends considerably less than the space between theadjacent parts of said end plates, thereby providing a conical air spacebet-weenfthe two sets of vanes and communlrating with the middleopenings of said plates, each of said vanes having at 1ts mner edge aforwardly directed flange adapted to collect the air in front of theadvancing face thereof and direct said air radially outward along suchface.

22. A device of the class described, comprising a pair of end plates,rotatably mounted, being spaced apart and open at their middle part andconverging toward each other at their peripheries, two sets of radiallydisposed, vanes respectively secured against said plates, said vanesbeing each of a width at their outer ends corresponding substantially tothe space between the (peripheries of said plates and being of a wi that their inner ends considerably less than the space between theadjacent parts of said end plates, thereby providing a conical air spacebetween the two sets of vanes and conimunicating with the middleopenings of said plates, each of said vanes having at its inner edge aforwardly directed flange adapted-t0 collect the air in front of theadvancing face thereof and. direct said air ra dially outwardly alongsuch face, said forwardly directed flanges being of a width at theirinner ends considerably less than the space between successive vanes ofthe same Signed at Chicago this 3rd day of June JOSEPH J. STOETZEL.

VVitness'es:

EUGEN A. RUMMLER,

A. J. A. W'rLLIAMs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washingto11,1).G. w

